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Weather April in Knoxville, United States of America Visitors to Knoxville during the month of April should plan on bringing a raincoat since it will be raining some days. The amount of rain is high with an average of 83mm (3.3in). The average maximum temperature lies around 16.0Â°C (60.8Â°F). This month is known as a chilly month.
The hottest temperatures at Knoxville are usually in the 90s Fahrenheit. It's rare for the thermometer here to reach 100 Â°F (38 Â°C). A day that hot shows up only once every three years on average, typically in June or August.